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Numerical Calculations of the B1g Raman Spectrum of the Two-Dimensional Heisenberg Model
A. W. Sandvik, S. Capponi, D. Poilblanc +1
The B1g Raman spectrum of the two-dimensional S=1/2 Heisenberg model is discussed within Loudon-Fleury theory at both zero and finite temperature. The exact T=0 spectrum for lattic…
Effect of Spin-1 Impurities in Dimerized Heisenberg Chains
P. M. Hansen, J. A. Riera, A. Delia +1
The effects of spin-1 impurities introduced in dimerized antiferromagnetic spin chains are studied using Lanczos diagonalization and quantum Monte Carlo simulations. Firstly, the m…
The Ferromagnetic Kondo Model for Manganites: Phase Diagram and Charge Segregation Effects
E. Dagotto, S. Yunoki, A. L. Malvezzi +5
The phase diagram of the ferromagnetic Kondo model for manganites is investigated using computational techniques. In clusters of dimensions 1 and 2, Monte Carlo simulations in the…
Revisiting two holes in a locally antiferromagnetic background: the role of retardation and Coulomb repulsion effects
Jose Riera, Elbio Dagotto
The problem of two holes in the presence of strong antiferromagnetic fluctuations is revisited using computational techniques. Two-dimensional clusters and 2-leg ladders with up to…
Enhancement of Antiferromagnetic Correlations Induced by Nonmagnetic Impurities: Origin and Predictions for NMR Experiments
Markus Laukamp, George Balster Martins, Claudio J. Gazza +5
Spin models that have been proposed to describe dimerized chains, ladders, two dimensional antiferromagnets, and other compounds are here studied when some spins are replaced by sp…
Diagonalization in Reduced Hilbert Spaces using a Systematically Improved Basis: Application to Spin Dynamics in Lightly Doped Ladders
E. Dagotto, G. B. Martins, J. Riera +2
A method is proposed to improve the accuracy of approximate techniques for strongly correlated electrons that use reduced Hilbert spaces. As a first step, the method involves a cha…